The aging temperature of beryllium copper is related to the content of Be, and alloys containing less than 2% of Be are suitable for aging treatment. For alloys with Be greater than 7%, the aging temperature is 301-331 °C, and the holding time is 1-3 hours (depending on the shape and thickness of the part. For high conductivity electrode alloys with Be less than 0.5%, due to the increase in melting point , the aging temperature is 450-481 ℃, and the holding time is 1-3 hours.
Corrosion depth (9-1×10-3 mm/year. After corrosion, there is no change in compressive strength and tensile strength, so it can be maintained in the sea for more than 40 years, which is irreplaceable for submarine cable repeater structures. Raw material. In hydrochloric acid substances, the annual corrosion depth is 0.0012-0.1175 mm in hydrochloric acid with a concentration of less than 80% (indoor temperature), and the corrosion is slightly accelerated when the concentration exceeds 80%. The corrosion resistance of stainless steel plates increases with the carbon content. Therefore, the carbon content of most stainless steel plates is relatively low, not more than 2%, and the Wc (carbon content) of some steels is even less than 0.03% (such as 00Cr1. The key aluminum alloy elements in stainless steel plates It is Cr (chromium). Only when the Cr content reaches a certain value, the steel has corrosion resistance. Therefore, the Cr (chromium) content of the stainless steel plate is generally at least 5%. The stainless steel plate also contains elements such as NiTiMnNNbMoSi.
Beryllium copper is an aluminum alloy with excellent comprehensive properties of structural mechanics, science and organic chemistry. After heat treatment, it has high compressive strength, ductility, wear resistance, fatigue resistance and temperature resistance. Copper also has high electrical conductivity, heat transfer, cold resistance and non-magnetic, no flames when impacted, easy for electric welding and fiber welding, and has good corrosion resistance in air, water and sea. Corrosion resistance rate of beryllium copper alloy in sea surface-×10-2 mm/year.
The chemical properties of beryllium are also special, it has the dual characteristics of metal materials and non-metal materials. The atomic radius of beryllium is very small, less than half that of magnesium. The organic chemical properties of beryllium are also close to those of magnesium and aluminum, and have much in common with aluminum. Beryllium has strong air oxidation characteristics, and can be converted into “BeO” air oxide film on the surface of beryllium in air oxygen. This kind of metal oxide is stable at room temperature and high temperature red heat.
Beryllium copper plate is a supersaturated solid solution copper-based alloy. It is a non-ferrous alloy with excellent mechanical properties, chemical properties and corrosion resistance. After solid solution and aging treatment, it has a high strength limit elastic limit equivalent to special steel. Yield limit and fatigue limit, but also have high electrical conductivity, thermal conductivity, high hardness and wear resistance, high creep resistance and corrosion resistance. The following briefly talks about the precautions for purchasing beryllium copper plates.
Beryllium bronze has good comprehensive properties. Its mechanical properties, namely strength, hardness, wear resistance and fatigue resistance, rank first in copper alloys. Its electrical conductivity, thermal conductivity, non-magnetic and anti-sparking properties cannot be compared with other copper materials. The strength and conductivity of beryllium bronze in the solid solution soft state are both at the value. After work hardening, the strength is increased, but the conductivity is still at the value. After aging heat treatment, its strength and electrical conductivity increased significantly.
The air oxide film of aluminum and silicon has high melting point, high compressive strength, good adhesion, and has certain maintenance characteristics at the smelting temperature. When smelting aluminum alloy profiles and aluminum-silicon-containing brass, attention should be paid to the operation steps to avoid frequent stirring to maintain the fineness of the air oxide film. That way, air oxidative ablation can be reasonably reduced even without masking maintenance. Valid action steps.